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A variable in FM view can be undefined, equals to NULL, or empty values.

Checking var "errors" defined/exists?: [#if errors??]yep[#else]nope[/#if]<br>
Default var "errors" if not defined/null: ${errors!"No error here"}<br>

[#-- You can't check empty value with bracket access!
errors.errorsMap exists? [#if errors.errorsMap??]yep[#else]nope[/#if]<br>
errors['errorsMap'] exists? [#if errors['errorsMap']??]yep[#else]nope[/#if]<br>
--]

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